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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ObjInfo.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.jsimpledb.core.DeletedObjectException;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import org.jsimpledb.core.ObjId;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import org.jsimpledb.core.ObjType;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import org.jsimpledb.core.Schema;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import org.jsimpledb.core.Transaction;<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span>/**<a name="line.16"></a>
<span class="sourceLineNo">017</span> * Utility class holding meta-data about a database object.<a name="line.17"></a>
<span class="sourceLineNo">018</span> */<a name="line.18"></a>
<span class="sourceLineNo">019</span>public class ObjInfo {<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>    private final ObjId id;<a name="line.21"></a>
<span class="sourceLineNo">022</span>    private final Schema schema;<a name="line.22"></a>
<span class="sourceLineNo">023</span>    private final ObjType type;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    /**<a name="line.25"></a>
<span class="sourceLineNo">026</span>     * Constructor.<a name="line.26"></a>
<span class="sourceLineNo">027</span>     *<a name="line.27"></a>
<span class="sourceLineNo">028</span>     * @param tx database transaction<a name="line.28"></a>
<span class="sourceLineNo">029</span>     * @param id the ID of the object to query<a name="line.29"></a>
<span class="sourceLineNo">030</span>     * @throws DeletedObjectException if object does not exist<a name="line.30"></a>
<span class="sourceLineNo">031</span>     */<a name="line.31"></a>
<span class="sourceLineNo">032</span>    public ObjInfo(Transaction tx, ObjId id) {<a name="line.32"></a>
<span class="sourceLineNo">033</span>        this.id = id;<a name="line.33"></a>
<span class="sourceLineNo">034</span>        this.schema = tx.getSchemas().getVersion(tx.getSchemaVersion(id));<a name="line.34"></a>
<span class="sourceLineNo">035</span>        this.type = this.schema.getObjType(id.getStorageId());<a name="line.35"></a>
<span class="sourceLineNo">036</span>    }<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>    public ObjId getObjId() {<a name="line.38"></a>
<span class="sourceLineNo">039</span>        return this.id;<a name="line.39"></a>
<span class="sourceLineNo">040</span>    }<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>    public Schema getSchema() {<a name="line.42"></a>
<span class="sourceLineNo">043</span>        return this.schema;<a name="line.43"></a>
<span class="sourceLineNo">044</span>    }<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>    public ObjType getObjType() {<a name="line.46"></a>
<span class="sourceLineNo">047</span>        return this.type;<a name="line.47"></a>
<span class="sourceLineNo">048</span>    }<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>    @Override<a name="line.50"></a>
<span class="sourceLineNo">051</span>    public String toString() {<a name="line.51"></a>
<span class="sourceLineNo">052</span>        return this.id + " type " + this.type.getName() + "#" + this.type.getStorageId()<a name="line.52"></a>
<span class="sourceLineNo">053</span>          + " version " + this.schema.getVersionNumber();<a name="line.53"></a>
<span class="sourceLineNo">054</span>    }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>    /**<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * Get object meta-data.<a name="line.57"></a>
<span class="sourceLineNo">058</span>     *<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * @param session parse session<a name="line.59"></a>
<span class="sourceLineNo">060</span>     * @param id the ID of the object to query<a name="line.60"></a>
<span class="sourceLineNo">061</span>     * @return object info, or null if object doesn't exist<a name="line.61"></a>
<span class="sourceLineNo">062</span>     */<a name="line.62"></a>
<span class="sourceLineNo">063</span>    public static ObjInfo getObjInfo(ParseSession session, ObjId id) {<a name="line.63"></a>
<span class="sourceLineNo">064</span>        try {<a name="line.64"></a>
<span class="sourceLineNo">065</span>            return new ObjInfo(session.getTransaction(), id);<a name="line.65"></a>
<span class="sourceLineNo">066</span>        } catch (DeletedObjectException e) {<a name="line.66"></a>
<span class="sourceLineNo">067</span>            return null;<a name="line.67"></a>
<span class="sourceLineNo">068</span>        }<a name="line.68"></a>
<span class="sourceLineNo">069</span>    }<a name="line.69"></a>
<span class="sourceLineNo">070</span>}<a name="line.70"></a>
<span class="sourceLineNo">071</span><a name="line.71"></a>




























































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